set term png font "./simsun.ttc, 9"
set output 'province_delay.png'

set title "全国各省连接服务器的平均网络延迟"
#set xlabel '省（自治区、直辖市）'
set ylabel 'Delay (ms)'
set yrange [0:]
set style data histogram
set style histogram cluster gap 1
set style fill solid border -1
set xtics nomirror rotate by -90
unset key
set grid ytics
plot 'prov_delay.dat' using 1:xtic(2)
